I was running at 200 RPM burnishing a bowl when my lathe(grizzly 0766) stopped. could not get it to start again . when I removed the cover on the VFD it had an code cF3. I reset it and now it will ramp up real slow and will only turn 610 rpm on slow speed how do I get it to run full speed?
Call Grizzly tech support. I am not sure what that code means, but I would also try to unplug for a couple hours, then see if it resets itself.
William, let us know what Grizzly tech support says about this. According to sec. 6-4 of the Delta Electronics manual for the VFD-M series inverter (the series that the G0766 uses), a cF3 fault code signals "OV or LV", i.e., either an over-voltage or a low-voltage condition. The "Corrective Action" is "Return to Factory." So a manual reset evidently is not sufficient.
Grizzly said failed CPU, new VFD coast $854.75 they said contact Delta for repairs or look online. Not much help....
A new code was entered in the manual - cF3 - Hardware Overheating - Make sure that the temperature of NTC(Negative Temperature Coefficient) is lowerthan 109°c after the power is turned on. This appears on page 5 of the manual.
William, do some Google searches for the Delta Electronics VFD-M series inverter. Also do an ebay search on DELTA VFD022M21A (the description from the Grizzly manual). When I did that on ebay I got 24 hits and the prices were about 1/3 to 1/2 of what Griz is charging. I recall that you had problems earlier with the speed control, having to replace the potentiometer and commenting that sometimes you still had some issues getting it to initially start up. So, perhaps your inverter was already showing some signs of problems. Since you don't have anything to lose, you may want to consider taking the cover off of your failed unit and stare at the electronics under a magnifying hood. Sometimes a problem can be as simple as a poor solder joint, a tin solder "whisker", a loose wire, a blown capacitor. Before yanking the unit out, make sure to take some pictures and notes of the wiring and the color codes of the wires.
Replaced my VFD with super cheap( less than $100 form Ebay) Askpower A131 VFD, work ok but I have to add a 12 volt fan to cool the vfd inside the box on back of the head when turning real slow 100-200 RPM while sanding for long periods of time it runs hot, Does not have a problem above 200 RPM. I will keep looking for a Delta on the cheap.
One of the things I am particularly pleased with on my G0766 is that the inverter and motor run very cool even a long periods of low rpm for sanding. I have paid attention to that issue, as my other Grizzly lathe had a D/C motor and controller on it, and it never even got warm.......seems the same with this A/C motor inverter on the 0766, which is a good thing.
If anyone else has a VFD failure, EE's here have used TECO brand for many years, and they're about $200 for up to a 5HP on the Bay.
